261171604656023 has 2 divisors, whose sum is σ = 261171604656024. Its totient is φ = 261171604656022.

The previous prime is 261171604655981. The next prime is 261171604656029. The reversal of 261171604656023 is 320656406171162.

261171604656023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261171604656023 - 2¹² = 261171604651927 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261171604656029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130585802328011 + 130585802328012.

It is an arithmetic number, because the mean of its divisors is an integer number (130585802328012).

Almost surely, 2^{261171604656023} is an apocalyptic number.

261171604656023 is a deficient number, since it is larger than the sum of its proper divisors (1).

261171604656023 is an equidigital number, since it uses as much as digits as its factorization.

261171604656023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2177280, while the sum is 50.

The spelling of 261171604656023 in words is "two hundred sixty-one trillion, one hundred seventy-one billion, six hundred four million, six hundred fifty-six thousand, twenty-three".